Removal And Installation Of Air Conditioner Unit Assembly - Komatsu PC88MR-10 Shop Manual

Removal and installation of air conditioner unit assembly

Place the machine on a level ground and
lower the work equipment to the ground in a
stable posture.
Stop the engine, turn the battery disconnect
switch to OFF position, and remove the key.
(For details, see "Testing and adjusting",
"Handling battery disconnect switch".)
Set the lock lever in LOCK position.
Removal
(PC88MR-K500-520-K-00-A)
1. Collect the refrigerant (air conditioner gas:
R134a) from the air conditioner circuit. [*1]
a Refill amount: 730 ± 50g
If refrigerant gas (air conditioner gas:
R134a) gets in your eyes, you may lose
your sight. And if it touches your skin,
you may suffer from frostbite. Put on
protective eyeglasses, gloves and
working clothes with long sleeves while
collecting the refrigerant or filling the air
conditioner circuit with the refrigerant.
a Never release the refrigerant (air conditioner
gas: R134a) to the atmosphere.
a Ask a qualified person for collecting, adding
and filling operations of the refrigerant (air
conditioner gas: R134a).
a Remove the undercover under the cooling
system.
2. Set coolant drain valve (1) to "OPEN" position,
and drain the coolant.
Coolant:
12 l l
3. Disconnect wiring and piping at the bottom
according to the following procedure.
1) Remove cover (2) on the left side of the
machine.
PC88MR-10
50 Disassembly and assembly
2) Open harness clamp (3), and remove the
harness.
3) Disconnect connectors V04 (4), V03 (5), V02
(6) and V01 (7).
4) Remove toolbox (8).
5) Disconnect high/low pressure switch
connector P17 (9).
6) Disconnect refrigerant hoses (10) (2 pieces).
[*2]
7) Disconnect heater hoses (11) (2 pieces).
8) Disconnect drain hoses (12) (2 pieces).
4. Remove front window assembly (13). For details,
see "Removal and installation of front window
assembly".
Cab and its attachments
(PC88MR-K500-924-K-00-A)
50-199